Identify the error(s) in the following question and correct it/them.

Athletes should replace their shoes after a mean distance of 700km with a standard deviation of 160 km. Monty, having to run a lot on the football field, decides to replace his shoes at a distance when only 30% of others would replace their shoes. At what distance should he replace his shoes? Z = x - H (-0.545) = x-700 160 160(-0.545) = X - 700 160(-0.545) + 700 = X X = 612.8 km